what are the codes p506, p420 and p2122?

Question

my car is getting the codes p506 p420 and p2112

Answer 1

P0506 Idle speed low

P0420 Catalytst low efficiency

P2122 Accelerator pedal position (APP) sensor 1 circuit low voltage

The catalytic code condition is set from the idle speed being too low. P2122 the (APP 1) circuit condition either caused P506 (idle speed low) Or P0506 is causing P2122. To do P0506 check for vacuum leaks especially the PCV valve and do a throttle body cleaning with a MAF (mass air flow) cleaning. Clear code retest. P2122 the most popular condition  that cause this code condition is the relay . As a safegaurd replace the relay listed as RUN/CRANK and PWR / TRN relay. When P2122 code appears it codes when its voltage is less than 0.13 volts.for more than 0.4 seconds. This is a small window of time and voltage. Start with a new relay.